The results of the food security monitoring survey of July 2013 organized by WFP and the Government, show that 23.7% of households are food insecure, a decrease compared to the rate of 32.3% observed in July 2012, but a slight increase compared to July 2011 (21.1%). More than 60% of food insecure households are located in areas with rain fed and agro-pastoral crops. In urban areas, primarily in Nouakchott, the rate of food insecurity increased from 10.9% in July 2012 to 16.9% in July 2013. These high rates are partially explained by the rural migration of the poorest households and the increase in food prices. In rural areas, causes include the depletion of farmer stocks during the lean season, the seasonal increase of local product prices and the decline in purchasing power of households (rising prices, repayment of debts and 2012 loss of livestock).